:root{--bg:#f5f1fe;--card:#fff;--ink:#2f2a45;--muted:#8b82ab;--primary:#8b5cf6;--primary-dark:#6d3fd6;--primary-soft:#ede7ff;--primary-tint:#f3eeff;--success:#2eb872;--fail:#e85c5c;--hint:#f6b73c;--ring:#8b5cf673;--day-current-bg:linear-gradient(135deg, #a78bfa, #8b5cf6);--room-bg:linear-gradient(180deg, #efe7ff, #e7dcff);--room-shadow:inset 0 2px 14px #50328c1f;--room-stage-bg:linear-gradient(180deg, #efe7ff 0%, #e7dcff 62%, #d8c9f6 62%, #d3c2f3 100%);--room-floor-bg:linear-gradient(180deg, #d8c9f6, #cdb9f1);--room-sill-bg:linear-gradient(180deg, #fff, #e7dcff);--room-btn-bg:linear-gradient(135deg, #a78bfa, #8b5cf6);--progress-fill-bg:linear-gradient(90deg, var(--primary), #b794f6);--progress-track-bg:#e6def8;--trace-letter-fill:var(--trace-letter-fill);--radius:20px;font-family:Nunito,Segoe 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18px;transition:transform .1s;display:flex;box-shadow:0 4px 14px #28324e1a}.branch-card:active{transform:scale(.97)}.branch-tasks{background:linear-gradient(135deg,#ffe9c8,#ffd9a0)}.branch-tens{background:linear-gradient(135deg,#d9f2ff,#b3e3ff)}.branch-order{background:linear-gradient(135deg,#e7e0ff,#d2c4ff)}.branch-column{background:linear-gradient(135deg,#d8f7e3,#b5eccb)}.branch-emoji{font-size:40px}.branch-title{font-size:22px;font-weight:800}.branch-subtitle{color:var(--ink);opacity:.65;font-size:14px}.branch-level{background:#ffffffb3;border-radius:999px;margin-top:8px;padding:4px 10px;font-size:13px;font-weight:700}.parent-link{color:var(--muted);background:0 0;border:none;margin:26px auto 8px;font-size:14px;text-decoration:underline}.session-header{align-items:center;gap:12px;padding-bottom:14px;display:flex}.progress-track{background:var(--progress-track-bg);border-radius:999px;flex:1;height:14px;overflow:hidden}.progress-fill{background:var(--progress-fill-bg);border-radius:999px;height:100%;transition:width .3s}.session-counter{color:var(--muted);font-weight:700}.session-body{flex-direction:column;flex:1;justify-content:center;display:flex}.two-pane{text-align:center;flex-direction:row;justify-content:center;align-items:center;gap:40px;width:100%;display:flex}.ex-left,.ex-right{flex-direction:column;align-items:center;gap:14px;display:flex}.ex-left{flex:1 1 0;min-width:0;max-width:580px}.ex-right{flex:0 0 380px;max-width:380px}@media (width<=860px){.two-pane{flex-direction:column;justify-content:flex-start;gap:16px}.ex-left,.ex-right{flex:none;width:100%;max-width:480px}}.session-complete{text-align:center;background:var(--card);border-radius:var(--radius);margin:auto;padding:36px 28px;box-shadow:0 4px 14px #28324e1a}.stars-big{font-size:56px}.paws-big{letter-spacing:4px;margin-top:4px;font-size:30px}.reward-stickers{background:var(--primary-soft);color:var(--primary-dark);border-radius:14px;padding:8px 16px;font-weight:800;display:inline-block}.mascot-btn{background:0 0;border:none;padding:0;line-height:0}.mascot-btn:active{transform:scale(.94)}.sticker-score{cursor:pointer;border:none;font-size:15px}.room-btn{background:var(--room-btn-bg);color:#fff;box-shadow:0 4px 0 var(--primary-dark);border:none;border-radius:16px;padding:12px 24px;font-size:17px;font-weight:800}.room-btn:active{box-shadow:0 2px 0 var(--primary-dark);transform:translateY(2px)}.room-screen{gap:12px;height:100dvh;min-height:0;overflow:hidden}.room-header{align-items:center;gap:12px;display:flex}.room-header h2{flex:1;margin:0}.sticker-count{background:var(--primary-soft);color:var(--primary-dark);border-radius:999px;padding:8px 16px;font-weight:800}.room{background:var(--room-bg);min-height:240px;box-shadow:var(--room-shadow);touch-action:none;-webkit-user-select:none;user-select:none;border-radius:24px;flex:1;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.room-stage{background:var(--room-stage-bg);touch-action:none;-webkit-user-select:none;user-select:none;flex:none;position:relative;overflow:hidden}.room-floor{background:var(--room-floor-bg);height:38%;position:absolute;bottom:0;left:0;right:0}.room-window{z-index:0;background:linear-gradient(#fff,#fff) 50%/7px 100% no-repeat,linear-gradient(#fff,#fff) 50%/100% 7px no-repeat,linear-gradient(165deg,#d7edff 0%,#bfe0ff 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18px;font-size:20px}.column-paper{background:var(--card);border-radius:var(--radius);flex-direction:column;align-items:center;width:min(560px,94vw);padding:48px 24px 22px;display:flex;position:relative;box-shadow:0 2px 10px #28324e12}.scratch-layer-canvas{border-radius:var(--radius);touch-action:none;z-index:0;width:100%;height:100%;position:absolute;inset:0}.scratch-layer-bar{z-index:2;flex-direction:column;gap:6px;display:flex;position:absolute;top:8px;right:8px}.column-grid{z-index:1;pointer-events:none;flex-direction:column;gap:6px;display:flex;position:relative}.column-row{justify-content:flex-end;align-items:center;gap:6px;display:flex}.column-sign{text-align:left;width:34px;font-size:28px;font-weight:800}.cell{border:1.5px solid #e0d6f4;border-radius:8px;justify-content:center;align-items:center;width:48px;height:54px;font-size:28px;font-weight:800;display:inline-flex}.cell-blank{border-color:#0000}.cell-input{pointer-events:auto;cursor:pointer;background:#f5f1fe;border:2px solid #c3b3ea}.cell-active{border-color:var(--primary);background:#ede7ff;animation:1s infinite pulse}@keyframes pulse{50%{opacity:.5}}.column-line{background:var(--ink);border-radius:2px;height:3px;margin:2px 0 2px 34px}.modal-backdrop{background:#28324e73;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal{background:var(--card);border-radius:var(--radius);flex-direction:column;gap:14px;width:100%;max-width:460px;padding:24px;display:flex}.modal h2{margin:0}.stats-table{border-collapse:collapse;width:100%;font-size:15px}.stats-table th,.stats-table td{text-align:left;border-bottom:1px solid #efe8fb;padding:8px 6px}.weak-facts{color:var(--muted);margin:0;font-size:14px}.day-path{-webkit-overflow-scrolling:touch;flex-direction:row;align-items:center;gap:18px;height:340px;padding:0 44px;scroll-padding:0 44px;display:flex;overflow:auto hidden}.day-node{background:var(--card);border:none;border-radius:50%;flex-direction:column;flex:none;justify-content:center;align-items:center;gap:2px;width:96px;height:96px;display:flex;position:relative;box-shadow:0 5px #d2c6ee}.day-node:active:not(:disabled){transform:translateY(3px);box-shadow:0 2px #d2c6ee}.day-done{background:linear-gradient(135deg,#ffe9a8,#ffd25e);box-shadow:0 5px #e3b53e}.day-current{background:var(--day-current-bg);box-shadow:0 5px 0 var(--primary-dark);animation:1.5s ease-in-out infinite bob}.day-current .day-num,.day-current .day-stars{color:#fff}@keyframes bob{0%,to{box-shadow:0 5px 0 var(--primary-dark), 0 0 0 0 var(--ring)}50%{box-shadow:0 5px 0 var(--primary-dark), 0 0 0 12px transparent}}.day-locked{cursor:default;background:#e6ebf6;box-shadow:0 5px 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#28324e14}.practice-emoji{font-size:24px}.session-title{flex:1;font-size:16px;font-weight:800}.session-subtitle{color:var(--muted);font-size:13px;font-weight:600}.session-progress{flex:none;height:14px;margin-bottom:14px}.task-subtitle{color:var(--primary-dark);margin:0;font-weight:700}.choice-list{flex-direction:column;gap:12px;width:100%;max-width:440px;display:flex}.choice-btn{background:var(--card);border:2px solid #ddd2f3;border-radius:16px;padding:16px;font-size:22px;font-weight:800;box-shadow:0 3px #ddd2f3}.choice-correct{border-color:var(--success);box-shadow:0 3px 0 var(--success);background:#c9f3dc}.choice-wrong{border-color:var(--fail);box-shadow:0 3px 0 var(--fail);background:#ffd6d6}.expr-input{border:3px dashed var(--primary);background:var(--card);letter-spacing:1px;border-radius:16px;justify-content:center;align-items:center;width:100%;min-width:220px;max-width:440px;min-height:56px;padding:12px 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